如何循环高度的滑块值？

Question

我在情节提要中成功创建了一个用户身高滑块和相应的代码，用于在滑块中为每个高度级别分配一个值，但正如您在下面看到的，我必须手动将每个新的高度变量复制并粘贴到让它工作。我很好奇专家会如何简化这段代码？谢谢！

*注意 - 我删除了身高 5'2 到 6'4 的代码，以免占用太多 space。

'''

@IBOutlet weak var yourHeightEquals: UILabel!

@IBOutlet weak var heightSliderOutlet: UISlider!

@IBAction func heightSliderAction(_ sender: UISlider) {
    
    heightSliderOutlet.value = roundf(heightSliderOutlet.value)
    
    let yourHeightText: String = "Your Height: "
    
    if heightSliderOutlet.value == 0 {
        
        let yourHeightString = "Choose Your Height"
        
        yourHeightEquals.text = yourHeightString
    }
    
    else if heightSliderOutlet.value == 1 {
        
        let yourHeightString = "<5'0"
        
        yourHeightEquals.text = yourHeightText + yourHeightString
    }
    
    else if heightSliderOutlet.value == 2 {
        
        let yourHeightString = "5'0"
        
        yourHeightEquals.text = yourHeightText + yourHeightString
    }
    
    else if heightSliderOutlet.value == 3 {
        
        let yourHeightString = "5'1"
        
        yourHeightEquals.text = yourHeightText + yourHeightString
    }

.......

    else if heightSliderOutlet.value == 19 {
        
        let yourHeightString = "6'5"
        
        yourHeightEquals.text = yourHeightText + yourHeightString
    }
    
    else if heightSliderOutlet.value == 20 {
        
        let yourHeightString = ">6'5"
        
        yourHeightEquals.text = yourHeightText + yourHeightString
    }
    
}

'''

Answer 1

您可以像这样使用 switch 语句。

@IBOutlet weak var heightSliderOutlet: UISlider!
@IBOutlet weak var yourHeightEquals: UILabel!
@IBAction func heightSliderAction(_ sender: UISlider) {
    let value = roundf(heightSliderOutlet.value)
    switch value {
    case 0:
        yourHeightEquals.text = "Choose Your Height"
    case 1:
        yourHeightEquals.text = "Your Height : <5'0"
    case 2...19:
        let height = 5.0 + ((value - 2) * 0.1)
        yourHeightEquals.text = "Your Height : \(height)"
    default:
        yourHeightEquals.text = "Your Height: >6'5"
    }
}

Answer 2

更新 - 上面的开关代码只适用于公制系统 - 我不得不为英尺和英寸稍微修改它，仍然比我原来的代码干净得多！

@IBOutlet weak var yourHeightEquals: UILabel!

@IBOutlet weak var heightSliderOutlet: UISlider!

@IBAction func heightSliderAction(_ sender: UISlider) {
    
    let value = roundf(heightSliderOutlet.value)
    
    switch value {
    case 0:
        yourHeightEquals.text = "Choose Your Height"
    case 1:
        yourHeightEquals.text = "Your Height: <5'0"
    case 2...11:
        let height = 5.0 + ((value - 2) * 0.1)
        let heightstring = String(height)
        let heightfoot = heightstring.dropLast(2)
        let heightinch = heightstring.dropFirst(2)
        let heightfootinch = heightfoot + "'" + heightinch
        yourHeightEquals.text = "Your Height: \(heightfootinch)"
    case 12:
        yourHeightEquals.text = "Your Height: 5'10"
    case 13:
        yourHeightEquals.text = "Your Height: 5'11"
    case 14...19:
        let height = 6.0 + ((value - 14) * 0.1)
        let heightstring = String(height)
        let heightfoot = heightstring.dropLast(2)
        let heightinch = heightstring.dropFirst(2)
        let heightfootinch = heightfoot + "'" + heightinch
        yourHeightEquals.text = "Your Height: \(heightfootinch)"
    default:
        yourHeightEquals.text = "Your Height: >6'5"
    }
    
}

如何循环高度的滑块值？

How to loop a Slider value for height?

xcode

loops

slider

ios

swift